I’m very new to football. What are the rules around sponsorships? A team can take funds from literally any company as a sponsorship? I assume there are rules around this (and sounds like City has broke the rules) but I find it hard to believe that everything they’ve done to get here is illegitimate?

I’m very new to football. What are the rules around sponsorships? A team can take funds from literally any company as a sponsorship? I assume there are rules around this (and sounds like City has broke the rules) but I find it hard to believe that everything they’ve done to get here is illegitimate?